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Import of the watch repository from Pebble
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Matthieu Jeanson
Katharine Berry
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10334 changed files with 2564465 additions and 0 deletions
394
third_party/duma/paging.h
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394
third_party/duma/paging.h
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/* Title: paging.h */
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/*
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* DUMA - Red-Zone memory allocator.
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* Copyright (C) 2006 Michael Eddington <meddington@gmail.com>
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* Copyright (C) 2002-2008 Hayati Ayguen <h_ayguen@web.de>, Procitec GmbH
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* Copyright (C) 1987-1999 Bruce Perens <bruce@perens.com>
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* License: GNU GPL (GNU General Public License, see COPYING-GPL)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*
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* FILE CONTENTS:
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* internal implementation file
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* contains system/platform dependent paging functions
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*/
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#ifndef DUMA_PAGING_H
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#define DUMA_PAGING_H
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/*
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* Lots of systems are missing the definition of PROT_NONE.
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*/
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#ifndef PROT_NONE
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#define PROT_NONE 0
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#endif
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/*
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* 386 BSD has MAP_ANON instead of MAP_ANONYMOUS.
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*/
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#if ( !defined(MAP_ANONYMOUS) && defined(MAP_ANON) )
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#define MAP_ANONYMOUS MAP_ANON
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#endif
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/*
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* For some reason, I can't find mprotect() in any of the headers on
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* IRIX or SunOS 4.1.2
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*/
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/* extern C_LINKAGE int mprotect(void * addr, size_t len, int prot); */
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#if !defined(WIN32)
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static caddr_t startAddr = (caddr_t) 0;
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#endif
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/* Function: stringErrorReport
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*
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* Get formatted error string and return. For WIN32
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* FormatMessage is used, strerror all else.
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*/
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static const char * stringErrorReport(void)
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{
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#if defined(WIN32)
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DWORD LastError;
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LPVOID lpMsgBuf;
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LastError = GetLastError();
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FormatMessage(
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FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS
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, NULL
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, LastError
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, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT) /* Default language */
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, (LPTSTR) &lpMsgBuf
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, 0
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, NULL
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);
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return (char*)lpMsgBuf; /* "Unknown error.\n"; */
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#elif defined(DUMA_NO_STRERROR)
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return DUMA_strerror(errno);
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#else
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return strerror(errno);
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#endif
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}
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/* Function: mprotectFailed
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*
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* Report that VirtualProtect or mprotect failed and abort
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* program execution.
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*/
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static void mprotectFailed(void)
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{
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#if defined(WIN32)
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DUMA_Abort("VirtualProtect() failed: %s", stringErrorReport());
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#else
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DUMA_Abort("mprotect() failed: %s.\nCheck README section 'MEMORY USAGE AND EXECUTION SPEED'\n if your (Linux) system may limit the number of different page mappings per process", stringErrorReport());
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#endif
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}
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/* Function: Page_Create
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*
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* Create memory. Allocates actual memory. Uses
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* VirtualAlloc on windows and mmap on unix.
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*
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* See Also:
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* <Page_Delete>
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*/
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static void *
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Page_Create(size_t size, int exitonfail, int printerror)
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{
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caddr_t allocation;
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#if defined(WIN32)
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allocation = VirtualAlloc(
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NULL /* address of region to reserve or commit */
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, (DWORD) size /* size of region */
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, (DWORD) MEM_COMMIT /* type of allocation */
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, (DWORD) PAGE_READWRITE /* type of access protection */
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);
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if ( (caddr_t)0 == allocation )
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{
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if ( exitonfail )
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DUMA_Abort("VirtualAlloc(%d) failed: %s", (DUMA_SIZE)size, stringErrorReport());
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else if ( printerror )
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DUMA_Print("\nDUMA warning: VirtualAlloc(%d) failed: %s", (DUMA_SIZE)size, stringErrorReport());
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}
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#elif defined(MAP_ANONYMOUS)
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/*
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* In this version, "startAddr" is a _hint_, not a demand.
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* When the memory I map here is contiguous with other
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* mappings, the allocator can coalesce the memory from two
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* or more mappings into one large contiguous chunk, and thus
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* might be able to find a fit that would not otherwise have
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* been possible. I could _force_ it to be contiguous by using
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* the MMAP_FIXED flag, but I don't want to stomp on memory mappings
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* generated by other software, etc.
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*/
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allocation = (caddr_t) mmap(
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startAddr
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, (int)size
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, PROT_READ|PROT_WRITE
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, MAP_PRIVATE|MAP_ANONYMOUS
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, -1
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, 0
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);
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#ifndef __hpux
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/*
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* Set the "address hint" for the next mmap() so that it will abut
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* the mapping we just created.
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*
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* HP/UX 9.01 has a kernel bug that makes mmap() fail sometimes
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* when given a non-zero address hint, so we'll leave the hint set
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* to zero on that system. HP recently told me this is now fixed.
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* Someone please tell me when it is probable to assume that most
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* of those systems that were running 9.01 have been upgraded.
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*/
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startAddr = allocation + size;
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#endif
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if ( allocation == (caddr_t)-1 )
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{
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allocation = (caddr_t)0;
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if ( exitonfail )
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DUMA_Abort("mmap(%d) failed: %s", (DUMA_SIZE)size, stringErrorReport());
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else if ( printerror )
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DUMA_Print("\nDUMA warning: mmap(%d) failed: %s", (DUMA_SIZE)size, stringErrorReport());
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}
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#else
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static int devZeroFd = -1;
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if ( devZeroFd == -1 )
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{
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devZeroFd = open("/dev/zero", O_RDWR);
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if ( devZeroFd < 0 )
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DUMA_Abort( "open() on /dev/zero failed: %s", stringErrorReport() );
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}
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/*
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* In this version, "startAddr" is a _hint_, not a demand.
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* When the memory I map here is contiguous with other
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* mappings, the allocator can coalesce the memory from two
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* or more mappings into one large contiguous chunk, and thus
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* might be able to find a fit that would not otherwise have
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* been possible. I could _force_ it to be contiguous by using
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* the MMAP_FIXED flag, but I don't want to stomp on memory mappings
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* generated by other software, etc.
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*/
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allocation = (caddr_t) mmap(
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startAddr
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, (int)size
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, PROT_READ|PROT_WRITE
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, MAP_PRIVATE
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, devZeroFd
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, 0
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);
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startAddr = allocation + size;
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if ( allocation == (caddr_t)-1 )
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{
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allocation = (caddr_t)0;
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if ( exitonfail )
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DUMA_Abort("mmap(%d) failed: %s", (DUMA_SIZE)size, stringErrorReport());
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else if ( printerror )
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DUMA_Print("\nDUMA warning: mmap(%d) failed: %s", (DUMA_SIZE)size, stringErrorReport());
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}
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#endif
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// TESTING
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// memset((void*)allocation, 0, startAddr);
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return (void *)allocation;
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}
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/* Function: Page_AllowAccess
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*
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* Allow memory access to allocated memory.
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*
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* See Also:
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* <Page_DenyAccess>
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*/
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void Page_AllowAccess(void * address, size_t size)
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{
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#if defined(WIN32)
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SIZE_T OldProtect, retQuery;
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MEMORY_BASIC_INFORMATION MemInfo;
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size_t tail_size;
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BOOL ret;
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while (size >0)
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{
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retQuery = VirtualQuery(address, &MemInfo, sizeof(MemInfo));
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if (retQuery < sizeof(MemInfo))
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DUMA_Abort("VirtualQuery() failed\n");
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tail_size = (size > MemInfo.RegionSize) ? MemInfo.RegionSize : size;
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ret = VirtualProtect(
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(LPVOID) address /* address of region of committed pages */
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, (DWORD) tail_size /* size of the region */
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, (DWORD) PAGE_READWRITE /* desired access protection */
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, (PDWORD) &OldProtect /* address of variable to get old protection */
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);
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if (0 == ret)
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mprotectFailed();
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address = ((char *)address) + tail_size;
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size -= tail_size;
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}
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#else
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if ( mprotect((caddr_t)address, size, PROT_READ|PROT_WRITE) < 0 )
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mprotectFailed();
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#endif
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}
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/* Function: Page_DenyAccess
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*
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* Deny access to allocated memory region.
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*
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* See Also:
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* <Page_AllowAccess>
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*/
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static void Page_DenyAccess(void * address, size_t size)
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{
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#if defined(WIN32)
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SIZE_T OldProtect, retQuery;
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MEMORY_BASIC_INFORMATION MemInfo;
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size_t tail_size;
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BOOL ret;
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while (size >0)
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{
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retQuery = VirtualQuery(address, &MemInfo, sizeof(MemInfo));
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if (retQuery < sizeof(MemInfo))
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DUMA_Abort("VirtualQuery() failed\n");
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tail_size = (size > MemInfo.RegionSize) ? MemInfo.RegionSize : size;
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ret = VirtualProtect(
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(LPVOID) address /* address of region of committed pages */
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, (DWORD) tail_size /* size of the region */
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, (DWORD) PAGE_NOACCESS /* desired access protection */
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, (PDWORD) &OldProtect /* address of variable to get old protection */
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);
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if (0 == ret)
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mprotectFailed();
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address = ((char *)address) + tail_size;
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size -= tail_size;
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}
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#else
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if ( mprotect((caddr_t)address, size, PROT_NONE) < 0 )
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mprotectFailed();
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#endif
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}
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/* Function: Page_Delete
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*
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* Free's DUMA allocated memory. This is the real deal, make sure
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* the page is no longer in our slot list first!
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*
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* See Also:
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* <Page_Create>
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*/
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static void Page_Delete(void * address, size_t size)
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{
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#if defined(WIN32)
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void * alloc_address = address;
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SIZE_T retQuery;
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MEMORY_BASIC_INFORMATION MemInfo;
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BOOL ret;
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/* release physical memory commited to virtual address space */
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while (size >0)
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{
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retQuery = VirtualQuery(address, &MemInfo, sizeof(MemInfo));
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if (retQuery < sizeof(MemInfo))
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DUMA_Abort("VirtualQuery() failed\n");
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if ( MemInfo.State == MEM_COMMIT )
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{
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ret = VirtualFree(
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(LPVOID) MemInfo.BaseAddress /* base of committed pages */
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, (DWORD) MemInfo.RegionSize /* size of the region */
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, (DWORD) MEM_DECOMMIT /* type of free operation */
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);
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if (0 == ret)
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DUMA_Abort("VirtualFree(,,MEM_DECOMMIT) failed: %s", stringErrorReport());
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}
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address = ((char *)address) + MemInfo.RegionSize;
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size -= MemInfo.RegionSize;
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}
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/* release virtual address space */
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ret = VirtualFree(
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(LPVOID) alloc_address
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, (DWORD) 0
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, (DWORD) MEM_RELEASE
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);
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if (0 == ret)
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DUMA_Abort("VirtualFree(,,MEM_RELEASE) failed: %s", stringErrorReport());
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#else
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if ( munmap((caddr_t)address, size) < 0 )
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Page_DenyAccess(address, size);
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#endif
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}
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/* Function: Page_Size
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*
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* Retrieve page size.
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*/
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static size_t
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Page_Size(void)
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{
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#if defined(WIN32)
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SYSTEM_INFO SystemInfo;
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GetSystemInfo( &SystemInfo );
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return (size_t)SystemInfo.dwPageSize;
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#elif defined(_SC_PAGESIZE)
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return (size_t)sysconf(_SC_PAGESIZE);
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#elif defined(_SC_PAGE_SIZE)
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return (size_t)sysconf(_SC_PAGE_SIZE);
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#else
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/* extern int getpagesize(); */
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return getpagesize();
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#endif
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}
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#endif /* DUMA_PAGING_H */
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